const Formatter = Intl.NumberFormat("en", { notation: "compact" });

export function numberWithCommas(input) {
  return input.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}

export function nFormatter(input) {
  return Formatter.format(input);
}

export function dollarFormat(input) {
  return new Intl.NumberFormat("en-us", {
    style: "currency",
    currency: "USD",
  }).format(input);
}

export function toPercentString(input = null, decimals = 0) {
  if (isNaN(input) || input === null) return "";
  const percentage = Math.round(input * 100);
  return (
    (decimals > 0 ? percentage.toFixed(decimals) : percentage.toString()) + "%"
  );
}

export function humanFileSize(bytes, si = false, dp = 1) {
  let isNumBytes = Number(bytes);
  const thresh = si ? 1000 : 1024;

  if (Math.abs(isNumBytes) < thresh) {
    return isNumBytes + " B";
  }
  const units = ["kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
  let u = -1;
  const r = 10 ** dp;

  do {
    isNumBytes /= thresh;
    ++u;
  } while (
    Math.round(Math.abs(isNumBytes) * r) / r >= thresh &&
    u < units.length - 1
  );

  return isNumBytes.toFixed(dp) + " " + units[u];
}

export function milliToHms(milli = 0) {
  const d = parseFloat(milli) / 1_000.0;
  var h = Math.floor(d / 3600);
  var m = Math.floor((d % 3600) / 60);
  var s = parseFloat((d % 3600.0) % 60);

  var hDisplay = h >= 1 ? h + "h " : "";
  var mDisplay = m >= 1 ? m + "m " : "";
  var sDisplay = s >= 0.01 ? s.toFixed(2) + "s" : "";
  return hDisplay + mDisplay + sDisplay;
}

//四舍五入保留n位小数，和toFixed区别在于，当为整数时，不会自动后面加上小数点和0
export const roundToDecimal = (num, n) => {
  const square = Math.pow(10, n || 1);
  return Math.round(Number(num) * square) / square;
};
